Build your own watch visually using ⚙ Configurator

Menu
0

Build your own watch visually using ⚙ Configurator

    0

    Your Cart is Empty

    shop

    ⚙ CONFIGURATOR
    Build Your Own Visually

    SKX013 Diver 38 Black Ultra Thin Edition — side profile showing 10.86mm ultra-thin case thickness

    Ultra Thin Edition
    Seikonaut Bracelet 20/16mm [TITANIUM] - - - - Lucius Atelier - Swiss Quality Seiko Watch Mod Parts

    Seikonaut
  • SEIKO MOD PARTS
  • WATCHES
  • MISC

  • ⚙ CONFIGURATOR
    Build Your Own Visually

  • SKX013 Diver 38 Black Ultra Thin Edition — side profile showing 10.86mm ultra-thin case thickness

    Ultra Thin Edition
  • Seikonaut Bracelet 20/16mm [TITANIUM] - - - - Lucius Atelier - Swiss Quality Seiko Watch Mod Parts

    Seikonaut
    • Home / Cases

    Cases

    Every build starts with the case, and this collection carries the whole range: Ultra Thin Edition cases, the GS and SKX013 platforms, and the larger SKX007-family divers — from 33mm to 42mm, in steel, titanium and DLC black. All of them run Seiko NH movements, and the NH34 GMT-ready cases say so right in the title. Dimensions, included parts and movement support are listed on every product page. Use the filters below to narrow by line, size or GMT-readiness.

    Narrow it down: All cases (30)Ultra Thin (14)NH34 GMT-Ready (13)33mm (1)34mm (1)36mm (18)38mm (7)39mm (2)42mm (1)Titanium (4)Gold (1)DLC Black (4)

    1908 Watch Case - 36mm - Yellow Gold [ULTRA THIN EDITION / NH34-Ready] - Solid - - - Lucius Atelier - Swiss Quality Seiko Watch Mod Parts
    1908 Watch Case - 36mm - Yellow Gold [ULTRA THIN EDITION / NH34-Ready] - Solid - - - Lucius Atelier - Swiss Quality Seiko Watch Mod Parts
    New
    1908 36mm Yellow Gold — Ultra Thin NH34-Ready Watch Case

    from $145 SGD
    1908 Watch Case - 36mm [ULTRA THIN EDITION / NH34-Ready] - Solid - - - Lucius Atelier - Swiss Quality Seiko Watch Mod Parts
    1908 Watch Case - 36mm [ULTRA THIN EDITION / NH34-Ready] - Solid - - - Lucius Atelier - Swiss Quality Seiko Watch Mod Parts
    New
    1908 36mm — Ultra Thin NH34-Ready Watch Case

    from $120 SGD
    62GS Watch Case - 36mm [ULTRA THIN EDITION / NH34-Ready] - Solid - - - Lucius Atelier - Swiss Quality Seiko Watch Mod Parts
    62GS Watch Case - 36mm [ULTRA THIN EDITION / NH34-Ready] - Solid - - - Lucius Atelier - Swiss Quality Seiko Watch Mod Parts
    62GS 36mm — Ultra Thin NH34-Ready Watch Case

    from $174 SGD
    Bauhaus Watch Case - 33mm [ULTRA THIN EDITION] - Solid - - - Lucius Atelier - Swiss Quality Seiko Watch Mod Parts
    Bauhaus Watch Case - 33mm [ULTRA THIN EDITION] - Solid - - - Lucius Atelier - Swiss Quality Seiko Watch Mod Parts
    New
    Bauhaus 33mm — Ultra Thin Watch Case

    from $145 SGD
    Datejust Watch Case - 36mm - NH [Solid] - - - Lucius Atelier - Swiss Quality Seiko Watch Mod Parts
    Datejust Watch Case - 36mm - NH [Solid] - - - Lucius Atelier - Swiss Quality Seiko Watch Mod Parts
    Datejust Watch Case - 36mm

    from $145 SGD
    Diver Watch Case - 38mm - SKX013/Submariner Edition (Fits NH & GMT Movements) - NH - Sapphire - - Lucius Atelier - Swiss Quality Seiko Watch Mod Parts
    Diver Watch Case - 38mm - SKX013/Submariner Edition (Fits NH & GMT Movements) - NH - Sapphire - - Lucius Atelier - Swiss Quality Seiko Watch Mod Parts
    Sold Out
    Diver Watch Case - 38mm - SKX013/Submariner Edition (Fits NH & GMT Movements)

    Sold Out
    Diver Watch Case - 42mm - SKX007/Submariner Edition (Fits NH & GMT Movements) - NH - Sapphire - - Lucius Atelier - Swiss Quality Seiko Watch Mod Parts
    Diver Watch Case - 42mm - SKX007/Submariner Edition (Fits NH & GMT Movements) - NH - Sapphire - - Lucius Atelier - Swiss Quality Seiko Watch Mod Parts
    Diver Watch Case - 42mm - SKX007/Submariner Edition (Fits NH & GMT Movements)

    from $20 SGD
    Explorer Watch Case - 36mm [ULTRA THIN DLC BLACK EDITION] - Solid - Coin Edge 6mm - Sterile - Lucius Atelier - Swiss Quality Seiko Watch Mod Parts
    Explorer Watch Case - 36mm [ULTRA THIN DLC BLACK EDITION] - Solid - Coin Edge 6mm - Sterile - Lucius Atelier - Swiss Quality Seiko Watch Mod Parts
    Explorer 36mm DLC Black — Ultra Thin Watch Case

    from $175 SGD
    Explorer Watch Case - 36mm [ULTRA THIN EDITION / TITANIUM POLISHED] - - - - Lucius Atelier - Swiss Quality Seiko Watch Mod Parts
    Explorer Watch Case - 36mm [ULTRA THIN EDITION / TITANIUM POLISHED] - - - - Lucius Atelier - Swiss Quality Seiko Watch Mod Parts
    Explorer 36mm Titanium Polished — Ultra Thin Watch Case

    $195 SGD
    Explorer Watch Case - 36mm [ULTRA THIN EDITION / TITANIUM SANDBLASTED] - - - - Lucius Atelier - Swiss Quality Seiko Watch Mod Parts
    Explorer Watch Case - 36mm [ULTRA THIN EDITION / TITANIUM SANDBLASTED] - - - - Lucius Atelier - Swiss Quality Seiko Watch Mod Parts
    Explorer 36mm Titanium Sandblasted — Ultra Thin Watch Case

    $195 SGD
    Explorer Watch Case - 36mm [ULTRA THIN EDITION] - Solid - - - Lucius Atelier - Swiss Quality Seiko Watch Mod Parts
    Explorer Watch Case - 36mm [ULTRA THIN EDITION] - Solid - - - Lucius Atelier - Swiss Quality Seiko Watch Mod Parts
    Explorer 36mm — Ultra Thin Watch Case

    from $120 SGD
    Explorer II Watch Case - 36mm [NH34-Ready] - NH [Solid] - - - Lucius Atelier - Swiss Quality Seiko Watch Mod Parts
    Explorer II Watch Case - 36mm [NH34-Ready] - NH [Solid] - - - Lucius Atelier - Swiss Quality Seiko Watch Mod Parts
    Explorer II Watch Case - 36mm [NH34-Ready]

    from $120 SGD
    Explorer Watch Case - 36mm v3 - NH [Solid] - - - Lucius Atelier - Swiss Quality Seiko Watch Mod Parts
    Explorer Watch Case - 36mm v3 - NH [Solid] - - - Lucius Atelier - Swiss Quality Seiko Watch Mod Parts
    Explorer Watch Case - 36mm v3

    from $145 SGD
    Explorer Watch Case - 39mm
    Explorer Watch Case - 39mm
    Explorer Watch Case - 39mm

    from $25 SGD
    GS 39mm Ultra Thin watch case in polished 316L steel — front view showing the slim bezel and pre-installed sapphire crystal
    GS 39mm Ultra Thin watch case in polished 316L steel — front view showing the slim bezel and pre-installed sapphire crystal
    New
    GS 39mm — Ultra Thin NH34-Ready Watch Case

    from $120 SGD
    GS Diver Watch Case - 36mm [NH34-Ready] - NH [Solid] - - - Lucius Atelier - Swiss Quality Seiko Watch Mod Parts
    GS Diver Watch Case - 36mm [NH34-Ready] - NH [Solid] - - - Lucius Atelier - Swiss Quality Seiko Watch Mod Parts
    GS Diver Watch Case - 36mm [NH34-Ready]

    from $120 SGD
    GS Watch Case - 36mm v2 - NH [Solid] - - - Lucius Atelier - Swiss Quality Seiko Watch Mod Parts
    GS Watch Case - 36mm v2 - NH [Solid] - - - Lucius Atelier - Swiss Quality Seiko Watch Mod Parts
    GS Watch Case - 36mm v2

    from $145 SGD
    Pilot Watch Case - 34mm [ULTRA THIN EDITION] - Solid - - - Lucius Atelier - Swiss Quality Seiko Watch Mod Parts
    Pilot Watch Case - 34mm [ULTRA THIN EDITION] - Solid - - - Lucius Atelier - Swiss Quality Seiko Watch Mod Parts
    Pilot 34mm — Ultra Thin NH34-Ready Watch Case

    from $120 SGD
    Seiko-Dweller 36mm [ULTRA THIN EDITION / TITANIUM] - - - - Lucius Atelier - Swiss Quality Seiko Watch Mod Parts
    Seiko-Dweller 36mm [ULTRA THIN EDITION / TITANIUM] - - - - Lucius Atelier - Swiss Quality Seiko Watch Mod Parts
    Seiko-Dweller 36mm — Ultra Thin Titanium Watch Case

    $378 SGD
    Seikonaut Watch Case - 38mm [ULTRA THIN EDITION / TITANIUM] - - - - Lucius Atelier - Swiss Quality Seiko Watch Mod Parts
    Seikonaut Watch Case - 38mm [ULTRA THIN EDITION / TITANIUM] - - - - Lucius Atelier - Swiss Quality Seiko Watch Mod Parts
    Seikonaut 38mm — Ultra Thin Titanium Watch Case

    $219 SGD
    Seikonaut Watch Case - 38mm [ULTRA THIN EDITION] - Solid - - - Lucius Atelier - Swiss Quality Seiko Watch Mod Parts
    Seikonaut Watch Case - 38mm [ULTRA THIN EDITION] - Solid - - - Lucius Atelier - Swiss Quality Seiko Watch Mod Parts
    Seikonaut 38mm — Ultra Thin Watch Case

    from $120 SGD
    Seikonaut Watch Case - 36mm - - - - Lucius Atelier - Swiss Quality Seiko Watch Mod Parts
    Seikonaut Watch Case - 36mm - - - - Lucius Atelier - Swiss Quality Seiko Watch Mod Parts
    Seikonaut Watch Case - 36mm

    $239 SGD
    SKX013 Diver 38 Black Ultra Thin Edition — front view with cyclops lens magnifying the date window position
    SKX013 Diver 38 Black Ultra Thin Edition — front view with cyclops lens magnifying the date window position
    New
    SKX013 Diver 38 Black — Ultra Thin Watch Case

    from $229 SGD
    SKX013 Diver 38 Green Ultra Thin Edition — front view with cyclops lens magnifying the date window position
    SKX013 Diver 38 Green Ultra Thin Edition — front view with cyclops lens magnifying the date window position
    New
    SKX013 Diver 38 Green — Ultra Thin Watch Case

    from $239 SGD
    SKX013 GS Diver Watch Case - 36mm (DLC BLACK EDITION) [NH34-Ready] - - - - Lucius Atelier - Swiss Quality Seiko Watch Mod Parts
    SKX013 GS Diver Watch Case - 36mm (DLC BLACK EDITION) [NH34-Ready] - - - - Lucius Atelier - Swiss Quality Seiko Watch Mod Parts
    SKX013 GS Diver Watch Case - 36mm (DLC BLACK EDITION) [NH34-Ready]

    $98 SGD
    SKX013 GS Diver Watch Case - 36mm [NH34-Ready] - - - - Lucius Atelier - Swiss Quality Seiko Watch Mod Parts
    SKX013 GS Diver Watch Case - 36mm [NH34-Ready] - - - - Lucius Atelier - Swiss Quality Seiko Watch Mod Parts
    SKX013 GS Diver Watch Case - 36mm [NH34-Ready]

    $88 SGD
    SKX013 Submariner Watch Case - 36mm (DLC BLACK EDITION) [NH34-Ready] - - - - Lucius Atelier - Swiss Quality Seiko Watch Mod Parts
    SKX013 Submariner Watch Case - 36mm (DLC BLACK EDITION) [NH34-Ready] - - - - Lucius Atelier - Swiss Quality Seiko Watch Mod Parts
    SKX013 Submariner Watch Case - 36mm (DLC BLACK EDITION) [NH34-Ready]

    $98 SGD
    SKX013 Submariner Watch Case - 36mm [NH34-Ready] - - - - Lucius Atelier - Swiss Quality Seiko Watch Mod Parts
    SKX013 Submariner Watch Case - 36mm [NH34-Ready] - - - - Lucius Atelier - Swiss Quality Seiko Watch Mod Parts
    SKX013 Submariner Watch Case - 36mm [NH34-Ready]

    $88 SGD
    SKX013 Watch Case - 38mm (DLC BLACK EDITION) [NH34-Ready] - - - - Lucius Atelier - Swiss Quality Seiko Watch Mod Parts
    SKX013 Watch Case - 38mm (DLC BLACK EDITION) [NH34-Ready] - - - - Lucius Atelier - Swiss Quality Seiko Watch Mod Parts
    SKX013 Watch Case - 38mm (DLC BLACK EDITION) [NH34-Ready]

    $98 SGD
    SKX013 Watch Case - 38mm [NH34-Ready] - - - - Lucius Atelier - Swiss Quality Seiko Watch Mod Parts
    SKX013 Watch Case - 38mm [NH34-Ready] - - - - Lucius Atelier - Swiss Quality Seiko Watch Mod Parts
    SKX013 Watch Case - 38mm [NH34-Ready]

    $88 SGD

    Watch Case Questions, Answered

    Sizing, movements, and where to start — the things modders weigh before choosing a case.

    Can I mod an existing Seiko, or do I need to build from scratch?

    Both. Path A modifies an existing Seiko (cheaper, more disassembly). Path B builds from scratch on an LA case (full design freedom, simpler assembly). New modders usually start with Path A; experienced modders move to Path B.

    What sizes do Seiko mod cases come in?

    The range runs from 33mm to 42mm. The heart of the line sits at 36mm — the size most of our platforms are built on — with 33mm and 34mm for smaller wrists, 38mm and 39mm in between, and a 42mm SKX007-family diver at the top. Each product page lists the case's exact dimensions, including thickness and lug-to-lug.

    What movement should I use — NH35, NH36, NH38, NH34, or NH70?

    NH35 if you want a date. NH36 if you want a day-date. NH38 for a clean no-date or open-heart dial. NH34 for a GMT travel watch. NH70/71/72 are skeletal. All share the same Type M architecture and are interchangeable across the Lucius Atelier smaller-case lineup.

    What is the thinnest Seiko mod case for NH movements?

    The Lucius Atelier Bauhaus 33mm Ultra Thin Edition is the thinnest NH-compatible Seiko mod case on the market at 9.93mm with a solid case back. The rest of the Ultra Thin lineup sits close behind.

    | Case | Thickness |
    |---|---|
    | **Bauhaus 33mm** | 9.93mm |
    | **Seikonaut 38mm** | 10.0mm |
    | **1908 36mm** (NH34 GMT-ready) | 10.75mm |
    | **SKX013 Diver 38** | 10.86mm |
    | **Pilot 34mm** | 10.96mm |

    For context, most Seiko mod cases on the market run 13–14mm thick. The Ultra Thin programme is an engineering effort to push the floor below 10mm while remaining NH-compatible.

    Why a smaller case for a Seiko mod?

    Smaller cases (33–38mm) wear better on most wrists, slip under a shirt cuff, and let dial designs read at correct proportions. The LA smaller-case lineup spans seven cases from 33mm Bauhaus to 38mm SKX013 Diver, every one Ultra Thin Edition.